Just got a test model in last Friday......our issued duty pistol currently is the 4043, which I personally can't stand, don't like, and would throw in the nearest snowbank if given most any other option. With that said...
Initial thoughts on the new M&P, considering that I won't get to shoot it until Wednesday:
The trigger is Sigma's....it is MUCH smoother than the 4043(wouldn't take much) and probably half the pull weight. The 3 size grips are a great idea, stolen from SW 99. At the base of the pistol is the "tool" that holds the grip to the frame and assists in disassembly of weapon.
Disassembly is goofy, in and of itself, I'll let you experience that one for yourself. As an LE instructor, I am scared to teach the masses of non-gun folks that will be carrying them.
If you've ever held up a Glock, then a Smith 4000 series right after, most notice a different pointing of the weapons. Glock is like holding a 2x4, and Smith is much more rounded and they each sit differently in your hand. The new MP sits more like a Glock, very much squared off. Ours came with Trijicons and mag disconnect.
I've always been more partial to the non-stainless firearms....something about using a stainless pistol for SWAT..... DUH.....more when I shoot it.
VJ